Drill sharpener



Jime 23192.5-

P. H. SCHEIB ET AL DRILL SHARPENER Filed April 30. 1923 Pefer Hwiz Patented June 2, 1925.

UNITED 1,540,187 PATENT errics..*

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Appneanon filed April so, 1923. serialNo. 635,705.

To all whom it concern: 1

Be it known that we, PETER H. SOHEIB and I-IJALMER C. GUs'rArsoN, citizens of the United- States, residinglat Denver, in the county of Denver and State of Colorado, have invented certain new and useful Improvements in'Drill"lSharpe11e1's, of which the following is a specification...

The present invention relates more particularly to the mounting of the dolly of a rock drill sharpener, and the object is to provide a structure of a simple and elfective character that will permit the ready removal of the dolly and its return mechanism, the latter constituting a part of the retaining means, and also acting as means for preventing the rotation of the dolly in its holder.

I11 the accompanying drawings?- Figure 1 is a side elevation of a well known type of rock drill sharpener, showing the improved dolly holder,

Figure 2 is a detail cross sectional view 011 an enlarged scale and on the line22 of Figure 1, r

Figure 3 is a sectional View on the line 3-3 of Figure 2.

In the embodiment illustrated, the rock drill comprises a base or support 4:, carrying a fixed clamping die 5 and a movable clamping die 6. Between these dies the drill steel is placed, and is held by the upper die 6 moving downwardly toward the lower die and clamping the drill steel stop there- A fluid-operated hammer 7, mounted on the base or support, includes a head, forming a dolly holder.

This holder comprises a body 8 suitably bolted as shown at 9 to the hammer, and having a longitudinal recess 10 for the reception of the dolly. This recess has an open upper side. The dolly comprises a shank 11 that is mounted to reciprocate in the seat 10 and is removable through its open side. On the projecting end .of the shank is a head 12 suitably formed to shape the end of the drill steel in a manner well understood. The dolly shank 11 has an upper flat side 13 that extends from the head 12 and terminates short of the rear end of said shank, forming a shoulder 14, illustrated particularly in Figure 3.

A closure for the open side of the seat 10 comprises a plate 15, having a; flat under face 16 that bears against thefl at, side 13,. and thus prevents the rotation pf the. dolly. This plate is provided onits sideedges with projecting notched cars 19 that receiveholding b'olts20, pivotally mounted as" shown at 21 on the sides of the body, said bolts obvicusly'holding t losure plate in place,

but permitting its ready removal, I p j The closure plate is furthermore provided with a longitudinal bore 22 opening at its rear end into a chamber 23, formed in said head. In said bore 22 is located a piston 24 that projects into the chamber 23 and bears against the'shoulder 14. A stop pin 25, located in the chamber 23, operates against a flat upper side 26 of the piston 2d, and serves to prevent the movement of said piston entirely from the bore 22, while permitting its reciprocation. Motive fluid is supplied to the front end of the bore 22 from the supply hose 27 of the sharpener by means of a branch pipe 28 leading from said supply hose 27 to a port 29' that opens intothe front end of the bore 22.

It will be evident that with this construction the dolly is operated on in the usual manner by the pneumatic hammer 7, and in turn operates on the work clamped by and between the dies 5 and 6. The dolly is readily removable by simply detaching the plate 15, and said plate performs a variety of functions. In th first place, it acts as a retainer for the dolly; it also constitutes means for preventing the rotation thereof in the seat 10, and it constitutes a cylinder member for the piston 24 that acts to move the dolly rearwardly or return it against the action of the hammer. Inasmuch as the closure plate 15 is a detachable member, it will be evidentthat it can be easily shaped and in case of necessary repairs or adjust ments, it can be easily removed.

From the foregoing, it is thought that the construction, operation and many advantages of the herein described invention will be apparent to those skilled in the art, with out further description, and it will be understood that various changes in the size,

shape, proportionand minor details of construction, may be resorted to without departing from the spirit or sacrificing any of the advantages of the invention.

Having thus fully described our invention, what; we claim as new, and desire to secure by Letters Patent, is V g 1. In apparatus of the character set forth, the combination with a fluid operated dollying hammer, of a dolly holder comprising a body having a dolly-receiving seat, a dolly that movably and detachably engages in the seat, a retainer for the dolly detachably mounted on the body, and dolly return means acting in opposition to the hammer and carried by the detachable retainer.

2. In apparatus of the character set forth, the combination with a fluid operated .dollying hammer,- of a dolly holder comprising a body having a dolly-receiving seat, a dolly that movably and detachably engages in the seat, a retainer for the dolly detachably mounted on the body and having a piston chamber, and a piston in the chamber operating against the dolly.

seat, of a dolly mounted to reciprocate i1 said seat and removable through the open slde, said dolly having aflat portion and a shoulder on said POl't-lOIl, a removable cover plate for the open side having a flat portion that bears against the flat portion of the dolly to prevent its rotation, and said cover plate having a piston chamber, and-a piston in the chamber bearing vagainst the shoulder.

In testimony whereof, we aflix our signatures in the presence of two witnesses.

PETER I-I. SGHEIB.

HJALMER G. GUSTAFSOZN.

Witnesses OMAR E. CLARK,

H. K. DUVALL. 

